*-1 2 02 *-2 20 2 *-3

2个回答

  • *-1 2 0 1 0 0 (1)

    2 *-2 2 0 1 0 (2)

    0 2 *-3 0 0 1 (3)

    用行变换(一步一步写太麻烦,这里两步两步写能快一些):将(1)+(2),将(2)-2*(1)

    *1 0 2 1 1 0 (1)

    0 *-2 -2 -2 -1 0 (2)

    0 2 *-3 0 0 1 (3)

    将(2)+(3)*1.5,将(3)-2*(2)

    *1 0 2 1 1 0 (1)

    0 *1 -6.5 -2 -1 1.5 (2)

    0 0 *10 4 2 -2 (3)

    将(1)-(3)*0.2,(2)+(3)*0.65:

    *1 0 0 0.2 0.6 0.4 (1)

    0 *1 0 0.6 0.3 0.2 (2)

    0 0 *10 4 2 -2 (3)

    将(3)除以10:

    *1 0 0 0.2 0.6 0.4 (1)

    0 *1 0 0.6 0.3 0.2 (2)

    0 0 *1 0.4 0.2 -0.2 (3)